Lights actually heat the air not the stuff in the enclosure more efficient/less cost. Of course there are some will tell you 60$ is less money than 9$ too...
Radiant heat tape (aka UTH, Flex watt, heat tape ext.) radiant heat panel, both heat things, not air. The most ambient air temp i have ever got from a panel is 5-6ºF, it might be ok I routinely get 10-14ºF from FL lights (twice the ambient air change for 1/6 the price and 1/10 the power=efficient), during the summer I have to turn them off too much air temps. I have never heard of a RHP being turned off during warmer months.
Increasing ambient air temps effects the humidity no matter what does it. The good news is higher air temps means lower RH is still fine for sheds.
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